For a regular double hung window I charge $5 for the whole package, screen, sill and interior exterior cleaning.  2nd floor, make it $6.  To make it clear, if you have a two story house with 20 windows expect to pay around $110-$120. 

 Storm windows, the price is double.  Triple the work, double the price.  You still win.

Unusual windows?  Really high windows?  

 

Feel free to call me.  I will gladly come by and take a look and give you a price.